The best part of Zack Snyder
’s is the mini-movie rolled into its opening credits, and it’s worth a mini-review of its own. “Army of the Dead
” opens as a brawny reanimated corpse bursts out of military captivity and infects the entire city of Las Vegas. Ever the maximalist ringmaster, Snyder unleashes a rollicking slo-mo montage of zombified revelers enacting a bloody takedown of Sin City as not one but two covers of “Viva Las Vegas
” follow the action in an operatic swell of chaos that shifts from dark comedy to wartime pandemonium. Self-serious mythologizing made Snyder’s four-hour “Justice League
” cut a slog; here, he gives way to a zanier style in tune with the material at hand.
Mercenaries stream into the deadly streets, guns a-blazing, as the ghoulish creatures multiply and tear into their attackers. Without a single introductory line, Snyder establishes a half-dozen warriors tasked with